Definition: This block contains a wide variety of disorders that differ in severity and clinical form but that are all attributable to the use of one or more psychoactive substances, which may or may not have been medically prescribed. The third character of the code identifies the substance involved, and the fourth character specifies the clinical state. The codes should be used, as required, for each substance specified, but it should be noted that not all fourth character codes are applicable to all substances. Identification of the psychoactive substance should be based on as many sources of information as possible. These include self-report data, analysis of blood and other body fluids, characteristic physical and psychological symptom ...[+++]s, clinical signs and behaviour, and other evidence such as a drug being in the patient's possession or reports from informed third parties. Many drug users take more than one type of psychoactive substance. The main diagnosis should be classified, whenever possible, according to the substance or class of substances that has caused or contributed most to the presenting clinical syndrome. Other diagnoses should be coded when other psychoactive substances have been taken in intoxicating amounts (common fourth character .0) or to the extent of causing harm (common fourth character .1), dependence (common fourth character .2) or other disorders (common fourth character .3-.9). Only in cases in which patterns of psychoactive substance-taking are chaotic and indiscriminate, or in which the contributions of different psychoactive substances are inextricably mixed, should the diagnosis of disorders resulting from multiple drug use (F19.-) be used. | Modifiers The following fourth-character subdivisions are for use with categories F10-F19: Code Title .0 Acute intoxication A condition that follows the administration of a psychoactive substance resulting in disturbances in level of consciousness, cognition, perception, affect or behaviour, o ...

Korsakoff's syndrome | Korsakoff syndrome | Korsakov's syndrome | Korsakow's syndrome | alcohol amnestic disorder | alcoholic dementia | amnesic syndrome | amnestic-confabulatory syndrome | amnestic psychosis | amnestic syndrome | cerebropathia psychica toxaemica | chronic alcoholic delirium | dysmnesic psychosis | dysmnesic syndrome | Korsakoff's disease | Korsakoff's psychosis | Korsakoff psychosis | Korsakov's psychosis | Korsakow's psychosis | Korsakosis | polyneuritic insanity | polyneuritic psychosis | polyneuritic syndrome | psychosis polyneuritica

vascular dementia | arteriosclerotic dementia | multidefect dementia | multiinfarct dementia | multi-infarct dementia

AIDS dementia complex [ AIDS-related dementia complex | HIV dementia | HIV encephalopathy | HIV-1-associated cognitive motor complex | HIV-associated cognitive motor complex | acquired-immune deficiency syndrome dementia complex | HIV-1 cognitive and motor complex ]

AIDS dementia complex | AIDS-related dementia | HIV dementia syndrome | HIV encephalopathy | HIV-associated dementia | ADC [Abbr.] | ARD [Abbr.]

Alzheimer disease [ AD | Alzheimer's disease | Alzheimer's dementia | Alzheimer dementia | senile dementia of the Alzheimer type ]

dementia due to head trauma | posttraumatic dementia

Definition: Dementia in Alzheimer's disease with onset before the age of 65, with a relatively rapid deteriorating course and with marked multiple disorders of the higher cortical functions. | Alzheimer's disease, type 2 Presenile dementia, Alzheimer's type Primary degenerative dementia of the Alzheimer's type, presenile onset

Definition: Dementia in Alzheimer's disease with onset after the age of 65, usually in the late 70s or thereafter, with a slow progression, and with memory impairment as the principal feature. | Alzheimer's disease, type 1 Primary degenerative dementia of the Alzheimer's type, senile onset Senile dementia, Alzheimer's type